Thanks for your replies! The problem, in my opinion, is not a JS problem because I have not modified the jScript code. And I have been doing some changes in the form.js file so it only checks one field and the result was the same! Also thanks for the link, it is a very interesting thread and will help me a lot. I am starting now to make some php error checking. The code is here, maybe it is a bit extense ... The previous developer coded most parts. Smarty is used. ******************************************************************* ####### editar.php ####### ******************************************************************* <? session_start(); $__usuario = $_SESSION["__usuario"]; require_once("Smarty.class.php"); include_once("alioli.ini"); include_once("ez_sql.php"); include_once("pagina.inc.php"); $id_lom = $HTTP_GET_VARS["id_lom"]; $pantalla = $HTTP_GET_VARS["pantalla"]; $smarty = new Smarty; $p = new pagina(); $p->menu(); if (!isset($__usuario)) { $p->Redireccionar(); exit;} $sql6 = "select * from lom_educational_learning_resource_types"; if ($datos_lom_educational_learning_resource_types = $db->get_results($sql6)){ foreach ($datos_lom_educational_learning_resource_types as $fila6 ){ $smarty->append('edu_learn_id', $fila6->id); $smarty->append('edu_learn_description', $fila6->description); } } $sql2 = "select * from avl_languages"; if ($datos_avl_languages = $db->get_results($sql2)){ foreach ($datos_avl_languages as $fila2 ){ $smarty->append('id_language', $fila2->id_language); $smarty->append('caption', $fila2->caption); $smarty->append('code', $fila2->code); } } $sql2 = "select * from lom_rights_types "; if ($datos_rights_types = $db->get_results($sql2)){ foreach ($datos_rights_types as $fila2 ){ $smarty->append('id_rights', $fila2->id); $smarty->append('caption_rights', $fila2->caption); $smarty->append('default_rights', $fila2->Iddefault); } } $sql1 = "select * from lom_educational_interactivity_type"; if ($datos_lom_educational_interactivity_type= $db->get_results($sql1)){ foreach ($datos_lom_educational_interactivity_type as $fila1 ){ $smarty->append('interactivity_type_id', $fila1->id); $smarty->append('interactivity_type_description', $fila1->description); } } $sql2 = "select * from lom_educational_intended_end_user_role"; if ($datos_lom_educational_intended_end_user_role = $db->get_results($sql2)){ foreach ($datos_lom_educational_intended_end_user_role as $fila2 ){ $smarty->append('intended_end_user_id', $fila2->id); $smarty->append('intended_end_user_description', $fila2->description); } } $sql3 = "select * from lom_educational_context"; if ($datos_lom_educational_context = $db->get_results($sql3)){ foreach ($datos_lom_educational_context as $fila3 ){ $smarty->append('context_id', $fila3->id); $smarty->append('context_description', $fila3->description); } } $sql4 = "select * from lom_educational_difficulty"; if ($datos_lom_educational_difficulty = $db->get_results($sql4)){ foreach ($datos_lom_educational_difficulty as $fila4 ){ $smarty->append('difficulty_id', $fila4->id); $smarty->append('difficulty_description', $fila4->description); } } $sql4 = "select * from lom_general_structure"; if ($datos_lom_general_structure = $db->get_results($sql4)){ foreach ($datos_lom_general_structure as $fila4 ){ $smarty->append('general_structure_id', $fila4->id_structure); $smarty->append('general_structure_description', $fila4->description); } } $sql5 = "select * from lom_general_aggregation_level"; if ($datos_lom_general_aggregation_level= $db->get_results($sql5)){ foreach ($datos_lom_general_aggregation_level as $fila5 ){ $smarty->append('aggregation_level_id', $fila5->id_aggregation_level); $smarty->append('aggregation_level_description', $fila5->description); } } $sql5 = "select id, extension, mime, ltf_order from lom_technical_format ORDER BY ltf_order"; if ($datos_lom_technical_format = $db->get_results($sql5)){ foreach ($datos_lom_technical_format as $fila5){ $smarty->append('technical_id', $fila5->id); $smarty->append('technical_datos', $fila5->mime." (".$fila5->extension.") "); } } if ($pantalla=='Modify'){ $sqlg3 = "SELECT g.loID, g.title, g.description, g.catalog, g.entity, g.keyword, g.coverage, g.id_structure, g.id_aggregation_level, g.id_language, g.copyrightcom FROM lom_general g WHERE g.loID='$id_lom'"; if ($datos_lom_general = $db->get_results($sqlg3)){ foreach ($datos_lom_general as $fila ){ $smarty->assign('id_lom', $fila->loID); $smarty->assign('title', $fila->title); $smarty->assign('description', $fila->description); $smarty->assign('entity', $fila->entity); $smarty->assign('keyword', $fila->keyword); $smarty->assign('coverage', $fila->coverage); $smarty->assign('catalog', $fila->catalog); $smarty->assign('id_structure1', $fila->id_structure); $smarty->assign('id_aggregation_levell', $fila->id_aggregation_level); $smarty->assign('id_language11', $fila->id_language); $smarty->assign('copyrightcom', $fila->copyrightcom); } } $sqlg1 = "SELECT id, interactivity_type, learning_resource_type, interactivity_level, semantic_density, intended_end_user_role, context, typical_age_range, difficulty, typical_learning_time, description, language FROM lom_educational WHERE loID='$id_lom'"; if ($datos_lom_educational = $db->get_results($sqlg1)){ foreach ($datos_lom_educational as $fila ){ $smarty->assign('id_educational', $fila->id); $smarty->assign('id_interactivity_type1', $fila->interactivity_type); $smarty->assign('id_learning_resource_type1', $fila->learning_resource_type); $smarty->assign('id_interactivity_level1', $fila->interactivity_level); $smarty->assign('id_intended_end_user_role1', $fila->intended_end_user_role); $smarty->assign('id_context1', $fila->context); $smarty->assign('id_semantic_density1', $fila->semantic_density); $smarty->assign('id_difficulty1', $fila->difficulty); $smarty->assign('typical_learning_time',$fila->typical_learning_time); $smarty->assign('typical_age_range',$fila->typical_age_range); $smarty->assign('educational_description',$fila->description); $smarty->assign('id_language21',$fila->language); $smarty->assign('id_edu',$fila->id); } } $sqlg2 = "SELECT distinct id_technical, id_format, size, location, requirement FROM lom_technical WHERE loID='$id_lom'"; if ($datos_lom_general = $db->get_results($sqlg2)){ foreach ($datos_lom_general as $fila ){ $smarty->assign('id_tec', $fila->id_technical); $smarty->assign('id_format1', $fila->id_format); $smarty->assign('size', $fila->size); $smarty->assign('location', $fila->location); $smarty->assign('requirement', $fila->requirement); } } } $smarty->assign('app_dir', $app_dir); $smarty->assign('pantalla', $pantalla); $smarty->assign('id_lom', $id_lom); $smarty->display('editar.tpl'); $p->pie(); ?>